Electric lamp.



No. 876,922. PATENTED JAN. 14, 1908.

' J. DE MARTINO.

ELECTRIC LAMP.

APPLICATION FILED JAN. 12, 1907.

UNITED STATES PATENT oEEroE.

JOSEPH MARTINO, OF BREESPORT, NEW YORK, ASSIGNR OF THREE-TENTHS TO CHARLES B. DAVIS AND THREE-TENTHS TO CHARLES H. KINLEY, BOTH OF BREESPORT, NEW YORK, AND ON E-TEN'III TO JAMES FRANCIS BURKE, OF PITTSBURG, PENNSYLVANIA.

ELECTRIC LAMP.

Specification of Letters Patent.

Patented Jan. 14, 1908.

I'o all whom it may concern.'

Be it known that I, JOSEPH DE MARTINO, a subject of the King of Italy, residing at Breesport, in the county of Ohemung and State of New York, have invented certain new and useful Improvements in Electric Lamps, of which the following is a specification, reference being had to the accompanying drawings.

My invention relates to improvements in electric lamps and particularly to such lamps in which is maintained a vacuum.

One object of my invention is to provide an electric lamp in which the filament may be removed, after it has become unfit for use, and may be replaced by anew filament; after which the air is again exhausted from the lamp and the latter is sealed.

. Other objects of my invention are to provide an electric lamp which will be simple and cheap in construction, and efficient and economical in use and operation; which will permit the interior walls of the globe to be cleaned; which will allow the same globe to be used with filaments of different candlepower; and which will allow the use of expensive fancy and ornamental globes without an increase in running expenses.

In the drawings illustrating the principle of my invention and the best mode now known to me of applying that principle,

Figure 1 is a sectional view showing the relative position of the parts `during the time the exhaust pump is in operation, after a ynew filament has been put in place; Fig. 2 shows in sectional elevation the relative position of the parts, when the lamp is ready for use; Fig. 3 is a sectional view on the line A-A, Fig. 1 Figs. 4 and 5 are details of the base-ring and carrier-ring, respectively; and Fig. 6 shows a modification.

The top a of the lamp is formed with the usual screw-threads b by which the lamp is secured in-its socket (not shown herein). In the top a is cementitious material c in which is embedded the up er end of each ofthe binding posts d, e, the ibwer end of each of which is formed with a slot f, in the wall of which engagesthe shank end of the binding-screw g. The top of the binding-post d is in electrical connection with the plate 7L insulated from the other parts of the lamp by the cementitious material c. The top of the binding post `e is in electrical connection with the threaded wall of the top a. Sen cured by one of the screws g in each of the slots f is one end e' of the filament j. These filaments will be sold separately, ready for insertion in the slots f.

The lower part of the top a is provided with a base-ring c in which is formed a hole lm, extending entirely through the Wall.

The base ring k is further formed with a V-shaped groove n within which fits the V-shaped carrier-ring or globe-holder 0,' formed with an annular groove p in which is ycemented the base of the globe The carrier ring o is formed with a holle 1' adapted to register with the" hole m, when the carrier ring o and base-ring 7c' are turned relative to each other to permit the exhaust of the air from the globe.

The operation of the device will be readily understood. After the filament has become inefiicient by long use, or broken so as to 'need to be re laced by a new iilament, the screws s iare lleosened, and the carrier ring o is removed from the V-sha ed groove n, carrying with it the globe g. he old iilament is removed by loosening the screws g, and a new ilament is put in its lace in the slots f, and secured therein by tig itening the screws g. The carrier-ring o with the globe secured therein is now re laced in the V- shaped groove n, and theiholes m and r are made to register with each other. hole is then inserted a connection from an air pump, and the air is exhausted from within the globe g in the usual manner. The carrier-ring o and the base-ring 7c are then turned relatively to each other, to throw the holes m and r out of register and into the position shown in Fig. 2. The screws s are then replaced and tightened, securing the carrier-ring o in place in the base-ring k. It Will be understood that the joints between the base-ring and the carrier-ring are made air-tight.

In the modification shown in Fig. 6,I the connecting plate h is secured to the Walls of the top a by pieces tv of rubber, ebonite or other suitable material.

I claim:

1. An electric lamp consisting "of a top; a base-ring secured to said top and formed with a groove the walls of which are perforated; a

In the carrier-ring mounted in said groove and formed with a perforation adapted to register With the perforations in the Walls of said oove; means for detachably securing said ase-ring and carrier-ring together; a globe mounted in said carrier-ring and a filament carried by said top and inclosed by said globe.

2. An electric lamp consisting of a top; filament-holding means mounted therein; a filament carried by said means; a base-ring connected With said top and having formed in its lower face a il-shaped groove and providedWith holes one of which connects said groove with the interior of said top and the JOSEPH DE MARTINO.

Witnesses:

JOHN M. HARTIGAN, EMMA SHAY. 

